Talking about the water resistance and oil resistance of thermoplastic elastomer TPE?

Time of issue:2020-04-14 21:02

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Thermoplastic elastomer TPE water resistance or oil resistance determines the scope of application of elastomers, but it is rarely heard that TPE elastomers have good water resistance and oil resistance, either water resistance or oil resistance, or oil resistance and water resistance, just like fish and bear palms Get. Today, the author talks about the problems of water resistance and oil resistance of TPE, as well as the reasons for water resistance and oil resistance.

Let me talk about the classification of thermoplastic elastomer TPE: styrenes, polyolefins, polyurethanes, polyesters, polyamides.

The first two types of styrenes and polyolefins are considered general-purpose elastomer materials, and the latter three types of polyurethane-based polyesters and polyamides are considered engineering-level elastomer materials. Just the general-purpose materials are all water-resistant and oil-resistant. The material, engineering grade oil resistance is very good, water resistance is slightly worse.

This is related to the substrate or macromolecular structure of the material. TPE, TPR, TPO can be filled with oil regardless of whether the substrate is SEBS or SBS or EPDM, because the butadiene section of SBS, the EB section of SEBS and the EP of EPDM are all oil-absorbing and plasticizable. Well. TPU, TPEE, and TPAE all have a polyester structure. Those who have learned organic chemistry should be very impressed by the reaction of acetic acid and ethanol to produce ethyl acetate. This is a reversible reaction. The reaction of ethyl acetate and water can also produce acetic acid and ethanol. Explain that ester can react with water, commonly known as hydrolysis, so polyester materials must be fully dried before use. Such as PA, PET, and TPAE, TPEE, etc.

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